forked from luck/tmp_suning_uos_patched
1a59d1b8e0
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) Tino Reichardt, 2012
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*/
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include "jfs_incore.h"
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#include "jfs_superblock.h"
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#include "jfs_discard.h"
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#include "jfs_dmap.h"
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#include "jfs_debug.h"
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/*
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* NAME: jfs_issue_discard()
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*
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* FUNCTION: TRIM the specified block range on device, if supported
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*
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* PARAMETERS:
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* ip - pointer to in-core inode
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* blkno - starting block number to be trimmed (0..N)
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* nblocks - number of blocks to be trimmed
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*
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* RETURN VALUES:
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* none
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*
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* serialization: IREAD_LOCK(ipbmap) held on entry/exit;
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*/
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void jfs_issue_discard(struct inode *ip, u64 blkno, u64 nblocks)
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{
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struct super_block *sb = ip->i_sb;
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int r = 0;
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r = sb_issue_discard(sb, blkno, nblocks, GFP_NOFS, 0);
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if (unlikely(r != 0)) {
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jfs_err("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d => failed!",
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sb, (unsigned long long)blkno,
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(unsigned long long)nblocks, r);
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}
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jfs_info("JFS: sb_issue_discard(%p, %llu, %llu, GFP_NOFS, 0) = %d",
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sb, (unsigned long long)blkno,
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(unsigned long long)nblocks, r);
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return;
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}
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/*
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* NAME: jfs_ioc_trim()
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*
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* FUNCTION: attempt to discard (TRIM) all free blocks from the
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* filesystem.
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*
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* PARAMETERS:
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* ip - pointer to in-core inode;
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* range - the range, given by user space
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*
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* RETURN VALUES:
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* 0 - success
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* -EIO - i/o error
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*/
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int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range)
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{
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struct inode *ipbmap = JFS_SBI(ip->i_sb)->ipbmap;
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struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap;
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struct super_block *sb = ipbmap->i_sb;
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int agno, agno_end;
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u64 start, end, minlen;
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u64 trimmed = 0;
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/**
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* convert byte values to block size of filesystem:
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* start: First Byte to trim
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* len: number of Bytes to trim from start
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* minlen: minimum extent length in Bytes
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*/
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start = range->start >> sb->s_blocksize_bits;
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end = start + (range->len >> sb->s_blocksize_bits) - 1;
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minlen = range->minlen >> sb->s_blocksize_bits;
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if (minlen == 0)
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minlen = 1;
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if (minlen > bmp->db_agsize ||
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start >= bmp->db_mapsize ||
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range->len < sb->s_blocksize)
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return -EINVAL;
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if (end >= bmp->db_mapsize)
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end = bmp->db_mapsize - 1;
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/**
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* we trim all ag's within the range
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*/
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agno = BLKTOAG(start, JFS_SBI(ip->i_sb));
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agno_end = BLKTOAG(end, JFS_SBI(ip->i_sb));
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while (agno <= agno_end) {
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trimmed += dbDiscardAG(ip, agno, minlen);
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agno++;
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}
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range->len = trimmed << sb->s_blocksize_bits;
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return 0;
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}
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